To assuage the existential angst that overwhelms Photoshop users when they see there's //no// eraser tool, we could create a feature where a configurable number of freehand tools can be added to the toolbox, with configurable icons, and connected to either a set of brush engines or a set of tags.
Problems:
* Intersection between current preset per tool and current preset per canvas (can be solved in KoToolManager)
* Should there be a maximum number of independent tools?
* Should we provide this for all (painting only?) tools?